CN113774389B - Regeneration method of gas diffusion plate for large-generation liquid crystal display production - Google Patents
Regeneration method of gas diffusion plate for large-generation liquid crystal display production Download PDFInfo
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- CN113774389B CN113774389B CN202111071110.3A CN202111071110A CN113774389B CN 113774389 B CN113774389 B CN 113774389B CN 202111071110 A CN202111071110 A CN 202111071110A CN 113774389 B CN113774389 B CN 113774389B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45559—Diffusion of reactive gas to substrate
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
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Abstract
The invention discloses a regeneration method of a gas diffusion plate for producing a large-generation liquid crystal display, which comprises the following steps of firstly detecting the flatness of the gas diffusion plate; then, shaping the gas diffusion plate; carrying out sand blasting treatment on the gas diffusion plate; then soaking and high-pressure cleaning are carried out on the gas diffusion plate; then carrying out water milling treatment, soaking and high-pressure cleaning on the gas diffusion plate; then carrying out sand blasting treatment and water grinding treatment on the gas diffusion plate; then, carrying out chemical cleaning, soaking and high-pressure cleaning on the gas diffusion plate; then, carrying out oxidation treatment and high-pressure cleaning on the gas diffusion plate; then, drying the gas diffusion plate; finally, the gas diffusion plate is baked. According to the invention, through optimization of the process flow, the probability of foreign matter aggregation and deposition is effectively reduced, so that the service life of the gas diffusion plate is prolonged, and the quality of the liquid crystal screen cannot be influenced because the foreign matters fall onto the glass panel.
Description
Technical Field
The invention relates to the technical field of large-generation liquid crystal display production, in particular to a regeneration method of a gas diffusion plate for large-generation liquid crystal display production.
Background
In the field of liquid crystal panels, large-generation liquid crystal panels refer to liquid crystal panels with dimensions greater than 2200mm × 2500mm, and in the production process of such liquid crystal panels, it is usually necessary to form an insulating film on the surface of a glass panel by Chemical Vapor Deposition (CVD), the main component of the insulating film usually being silicon nitride/silicon oxide.
In order to ensure the uniformity and the film quality of the formed insulating film, the uniformity of gas diffusion and the cleanliness of a diffusion environment need to be ensured in the film forming process. To achieve this, a gas diffusion plate of aluminum is generally used, on which gas diffusion holes are generally uniformly and equidistantly distributed.
Influenced by the use environment, the gas diffusion plate can be shocked or bruised in the use process, and needs to be regenerated regularly, and the traditional regeneration treatment mode adopts dry grinding and chemical cleaning. In the dry grinding, the gas diffusion plate is ground and polished by the grinding material, no water is added in the process, the cutting force is strong, the grinding efficiency is high, but under high-speed rotation or vibration, the direct friction between the grinding material and the aluminum material can generate a large amount of heat, and the aluminum material is easy to burn. In addition, by polishing in this way, an amorphous deteriorated layer is easily formed on the surface of the gas diffusion plate.
After the gas diffusion plate repaired by the conventional regeneration treatment method is put into use again for a period of time (generally, one month), foreign matters are gathered and deposited on the surface of the gas diffusion plate, and the foreign matters fall onto the glass panel, so that the quality of the liquid crystal display is abnormal, and the service life of the gas diffusion plate is also influenced.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides a regeneration method of a gas diffusion plate for producing a large-generation liquid crystal display, which reduces the probability of foreign matters easily gathered and deposited in the use process of the gas diffusion plate through the optimization of a process flow so as to prolong the service life of the gas diffusion plate.
In order to achieve the purpose, the invention provides the following technical scheme:
a regeneration method of a gas diffusion plate for producing a large-generation liquid crystal display screen is characterized by comprising the following steps: the method specifically comprises the following steps:
s1, placing a gas diffusion plate on a platform, detecting the flatness of the gas diffusion plate, and judging whether the gas diffusion plate is qualified or not;
s2, sending the unqualified gas diffusion plate into a shaping furnace for shaping treatment to obtain a qualified gas diffusion plate;
s3, performing sand blasting treatment on the qualified gas diffusion plate obtained by the detection in the step S1 and the shaping treatment in the step S2, removing foreign matters generated on the surface of the gas diffusion plate in the using process, and then performing micro-inspection on the foreign matters in each gas diffusion hole on the gas diffusion plate;
s4, soaking the gas diffusion plate subjected to sand blasting treatment in the step S3 in a sodium hydroxide solution, removing foreign matters generated in the using process in each gas diffusion hole on the gas diffusion plate, and then performing high-pressure cleaning to remove residual liquid medicine and stains on the surface of the gas diffusion plate and in each gas diffusion hole;
s5, carrying out water grinding treatment on the gas diffusion plate cleaned in the step S4, grinding off residual foreign matters on the surface of the gas diffusion plate and plaques formed on the surface of the gas diffusion plate due to corrosion of the sodium hydroxide solution after soaking in the step S4, then soaking in the sodium hydroxide solution, removing aluminum powder and dirt remained after water grinding, and then carrying out high-pressure cleaning to remove residual liquid medicine and dirt on the surface of the gas diffusion plate and in each gas diffusion hole;
s6, performing sand blasting treatment on the gas diffusion plate cleaned in the step S5 to enable the surface roughness of the gas diffusion plate to reach 1~5 microns, and then performing water grinding treatment to remove the tip of the surface of the gas diffusion plate and a naturally generated oxide film;
s7, chemically cleaning the gas diffusion plate subjected to the water milling treatment in the step S6 to remove the residual tips and the oxide film on the surface of the gas diffusion plate, soaking the gas diffusion plate in a nitric acid solution to remove foreign matters generated after the chemical cleaning, so that a uniform passivation layer is generated on the surface of the gas diffusion plate, and then performing high-pressure cleaning to remove residual liquid medicine and stains on the surface of the gas diffusion plate and in each gas diffusion hole;
s8, putting the gas diffusion plate cleaned in the step S7 into sulfuric acid solution for oxidation treatment, so that an oxide film with the thickness of 3~5 mu m is generated on the surface of the gas diffusion plate, and then performing high-pressure cleaning to thoroughly remove residual liquid medicine and stains on the surface of the gas diffusion plate and in each gas diffusion hole;
s9, drying the cleaned gas diffusion plate in the step S8 by adopting compressed dry air;
s10, vertically sending the blow-dried gas diffusion plate into an oven for baking, and taking out the gas diffusion plate after baking;
in the step S3 and the step S6, a sand blasting machine is adopted to perform sand blasting treatment on two surfaces of the gas diffusion plate respectively, wherein the air pressure of the sand blasting treatment in the step S3 is 0.5Mpa, the sand material adopts 80# alumina sand, the moving speed of a spray gun is 35m/min, and the translation distance of the spray gun is 20mm; the air pressure of the sand blasting treatment in the step S6 is 0.4Mpa, the sand material adopts 80# alumina sand, the moving speed of the spray gun is 35m/min, and the translation distance of the spray gun is 20mm;
in the steps S4 and S5, the density of the sodium hydroxide solution is 5-15g/L, wherein the soaking time in the step S4 is 30min, and the soaking time in the step S5 is 10min;
in the step S7, the cleaning solution for chemical cleaning is a sodium hydroxide solution with the density of 60-80g/L and the temperature of 50-60 ℃, and the cleaning time is 30S; the concentration of the nitric acid solution is 10-20%, the temperature is 30-40 ℃, and the soaking time is 5min;
in the step S8, the density of the sulfuric acid solution is 180 to 220g/L, the temperature is 15 to 20 ℃, and the oxidation time is 20min.
Further, in the step S1, the gas diffusion plate is placed on a marble platform, the flatness of the gas diffusion plate is detected by using a laser coordinate system, and the measured flatness value is compared with a standard value, so that whether the gas diffusion plate is qualified or not can be judged.
Further, in the step S2, the unqualified gas diffusion plate is sent into a shaping furnace, the temperature in the shaping furnace is gradually increased from room temperature to 550 ℃ within 12 hours, then the temperature is kept at 550 ℃ for 12 hours, then the gas diffusion plate is gradually cooled to room temperature within 12 hours and then taken out, then the shaped gas diffusion plate is placed on a marble platform, the flatness of the gas diffusion plate is detected by a laser coordinatograph, and the measured flatness value is compared with a standard value to obtain the qualified gas diffusion plate.
Further, in the step S3, the presence or absence of foreign matter generated during use in each gas diffusion hole of the gas diffusion plate is checked by using a microscope with a magnification of 200.
Further, in the steps S4 and S5, the pressure of the high-pressure cleaning is 50Mpa, and the cleaning time is 1h.
Further, in the step S10, the baking temperature is 150 ℃ and the baking time is 2 hours.
Compared with the prior art, the invention has the beneficial effects that:
the invention can obtain better surface condition by adopting a water milling treatment mode, the surface temperature of the gas diffusion plate is relatively low during the water milling treatment, an amorphous metamorphic layer is not easy to generate when the surface defects of the gas diffusion plate are removed, foreign matters and naturally generated infirm oxidation layers in the surface of the gas diffusion plate and each gas diffusion hole can be removed to the maximum extent by combining the modes of sand blasting, liquid medicine cleaning and the like for a plurality of times at the rear end, finally, a uniform and compact oxidation film is produced on the surface of the gas diffusion plate, the foreign matters can not fall off under the high temperature condition, the probability of foreign matter aggregation and deposition is effectively reduced, the service life of the gas diffusion plate is prolonged, and the quality of a liquid crystal screen can not be influenced because the foreign matters fall onto a glass panel.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, a method for regenerating a gas diffusion plate for producing a large-generation liquid crystal display panel specifically includes the following steps:
s1, placing the gas diffusion plate on a platform, detecting the flatness of the gas diffusion plate, and judging whether the gas diffusion plate is qualified or not.
Specifically, the gas diffusion plate is placed on a marble platform with the size of 3m multiplied by 80cm (the marble platform with the size can be matched with the size of all the gas diffusion plates at present), the planeness of the gas diffusion plate is detected by adopting a laser coordinate instrument, namely, 81 measurement points with the total number of 9 multiplied by 9 are uniformly selected on the gas diffusion plate, three zero coordinates are positioned during measurement, a measurement plane is determined, the planeness values of the surface of the gas diffusion plate are further measured, namely, 81 planeness values with different sizes are obtained, the measured planeness value is obtained by subtracting the minimum value from the maximum value, and the measured planeness value is compared with a standard value, so that whether the gas diffusion plate is qualified or not can be judged.
It should be noted that, because the marble mostly adopts granite, the main component of granite is silica, and granite has a history of thousands of years underground, the marble has the following characteristics:
1. the thermal stability is good, the thermal expansion coefficient is low, and the thermal deformation is not easy to generate;
2. the shape is stable, and the problem that the metal material is deformed due to stress release can not occur;
3. the processing is convenient, the flatness requirement can be conveniently ground, and the process is far simpler than that of ceramics;
4. has certain shock absorption performance;
5. has high hardness and is not easy to wear.
Therefore, the marble platform is not easy to change due to environmental change, and the measurement precision and the repeatability precision can be effectively ensured.
S2, sending the unqualified gas diffusion plate into a shaping furnace for shaping treatment to obtain the qualified gas diffusion plate.
Specifically, unqualified gas diffusion plates are sent into a shaping furnace, the temperature in the shaping furnace is gradually increased from room temperature to 550 ℃ within 12 hours, then the temperature is kept at 550 ℃ for 12 hours, then the gas diffusion plates are gradually cooled to the room temperature within 12 hours and then taken out, the shaped gas diffusion plates are placed on a marble platform, a laser coordinatograph is adopted to detect the planeness of the gas diffusion plates, the measured planeness value is compared with a standard value, and qualified gas diffusion plates are obtained, and the specific detection process is the same as the above.
S3, performing sand blasting treatment on the qualified gas diffusion plate obtained by the detection in the step S1 and the shaping treatment in the step S2, removing foreign matters generated on the surface of the gas diffusion plate in the using process, and then performing micro-inspection on the foreign matter in each gas diffusion hole on the gas diffusion plate.
Specifically, a sand blasting machine is adopted to perform sand blasting treatment on two surfaces of the gas diffusion plate respectively, the air pressure of the sand blasting treatment is 0.5Mpa, the sand material is 80# alumina sand, the moving speed of the spray gun is 35m/min, and the translation distance of the spray gun is 20mm.
The micro-inspection of the foreign matters in the gas diffusion holes is to use a microscope with a magnification of 200 times to inspect whether the foreign matters are generated in the gas diffusion holes on the gas diffusion plate during the use process.
And S4, soaking the gas diffusion plate subjected to sand blasting in the step S3 in a sodium hydroxide solution, removing foreign matters generated in the using process in each gas diffusion hole on the gas diffusion plate, and then performing high-pressure cleaning to remove residual liquid medicine and stains on the surface of the gas diffusion plate and in each gas diffusion hole.
Specifically, the density of the sodium hydroxide solution is 10g/L, and the soaking time is 30min; the pressure of the high-pressure cleaning is 50Mpa, and the cleaning time is 1h.
And S5, carrying out water grinding treatment on the gas diffusion plate cleaned in the step S4, grinding off residual foreign matters on the surface of the gas diffusion plate and plaques formed on the surface of the gas diffusion plate due to corrosion of the sodium hydroxide solution after soaking in the step S4, then soaking in the sodium hydroxide solution to remove aluminum powder and dirt remained after water grinding, and then carrying out high-pressure cleaning to remove residual liquid medicine and dirt on the surface of the gas diffusion plate and in each gas diffusion hole.
Specifically, the density of the sodium hydroxide solution is 10g/L, and the soaking time is 10min; the pressure of the high-pressure cleaning is 50Mpa, and the cleaning time is 1h.
S6, carrying out sand blasting treatment on the gas diffusion plate cleaned in the step S5 to enable the surface roughness of the gas diffusion plate to reach 3 microns, and then carrying out water grinding treatment to remove the tip of the surface of the gas diffusion plate and a naturally generated oxidation film.
Specifically, a sand blasting machine is adopted to perform sand blasting treatment on two surfaces of the gas diffusion plate once respectively, the air pressure of the sand blasting treatment is 0.4Mpa, 80# alumina sand is adopted as a sand material, the moving speed of a spray gun is 35m/min, and the translation distance of the spray gun is 20mm.
And S7, chemically cleaning the gas diffusion plate subjected to the water milling treatment in the step S6 to remove the tips and the oxidation film remained on the surface of the gas diffusion plate, soaking the gas diffusion plate in a nitric acid solution to remove foreign matters generated after the chemical cleaning so as to enable the surface of the gas diffusion plate to generate a uniform passivation layer, and then performing high-pressure cleaning to remove the liquid medicine and the stains remained on the surface of the gas diffusion plate and in each gas diffusion hole.
Specifically, the cleaning solution for chemical cleaning adopts a sodium hydroxide solution with the density of 80g/L and the temperature of 60 ℃, and the cleaning time is 30S; the concentration of the nitric acid solution is 15%, the temperature is 40 ℃, and the soaking time is 5min.
The pressure of the high-pressure cleaning is 50Mpa, and the cleaning time is 1h.
And S8, putting the gas diffusion plate cleaned in the step S7 into sulfuric acid solution for oxidation treatment to generate an oxide film with the thickness of 3 microns on the surface of the gas diffusion plate, and then performing high-pressure cleaning to thoroughly remove residual liquid medicine and dirt on the surface of the gas diffusion plate and in each gas diffusion hole.
Specifically, the density of the sulfuric acid solution is 200g/L, the temperature is 20 ℃, and the oxidation time is 20min.
The pressure of the high-pressure cleaning is 50Mpa, and the cleaning time is 1h.
S9, drying the cleaned gas diffusion plate in the step S8 by adopting compressed dry air;
s10, vertically sending the blow-dried gas diffusion plate into an oven for baking, and taking out the gas diffusion plate after baking.
Specifically, the baking temperature is 150 ℃, and the baking time is 2h.
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.
Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (6)
1. A regeneration method of a gas diffusion plate for producing a large-generation liquid crystal display is characterized by comprising the following steps: the method specifically comprises the following steps:
s1, placing a gas diffusion plate on a platform, detecting the flatness of the gas diffusion plate, and judging whether the gas diffusion plate is qualified or not;
s2, sending the unqualified gas diffusion plate into a shaping furnace for shaping treatment to obtain a qualified gas diffusion plate;
s3, performing sand blasting treatment on the qualified gas diffusion plate obtained by detection in the step S1 and shaping in the step S2, removing foreign matters generated on the surface of the gas diffusion plate in the using process, and then performing micro-inspection on the foreign matter conditions in each gas diffusion hole on the gas diffusion plate;
s4, putting the gas diffusion plate subjected to sand blasting treatment in the step S3 into a sodium hydroxide solution for soaking, removing foreign matters generated in the using process in each gas diffusion hole on the gas diffusion plate, and then performing high-pressure cleaning to remove residual liquid medicine and stains on the surface of the gas diffusion plate and in each gas diffusion hole;
s5, carrying out water grinding treatment on the gas diffusion plate cleaned in the step S4, grinding off residual foreign matters on the surface of the gas diffusion plate and plaques formed on the surface of the gas diffusion plate due to corrosion of the sodium hydroxide solution after soaking in the step S4, then soaking in the sodium hydroxide solution, removing aluminum powder and dirt remained after water grinding, and then carrying out high-pressure cleaning to remove residual liquid medicine and dirt on the surface of the gas diffusion plate and in each gas diffusion hole;
s6, performing sand blasting treatment on the gas diffusion plate cleaned in the step S5 to enable the surface roughness of the gas diffusion plate to reach 1~5 microns, and then performing water grinding treatment to remove the tip of the surface of the gas diffusion plate and a naturally generated oxide film;
s7, chemically cleaning the gas diffusion plate subjected to the water milling treatment in the step S6 to remove tips and oxide films remained on the surface of the gas diffusion plate, soaking the gas diffusion plate in a nitric acid solution to remove foreign matters generated after the chemical cleaning, so that a uniform passivation layer is generated on the surface of the gas diffusion plate, and then performing high-pressure cleaning to remove liquid medicine and stains remained on the surface of the gas diffusion plate and in each gas diffusion hole;
s8, putting the gas diffusion plate cleaned in the step S7 into sulfuric acid solution for oxidation treatment, so that a layer of oxidation film with the thickness of 3~5 mu m is generated on the surface of the gas diffusion plate, and then carrying out high-pressure cleaning to thoroughly remove residual liquid medicine and stains on the surface of the gas diffusion plate and in each gas diffusion hole;
s9, drying the gas diffusion plate cleaned in the step S8 by adopting compressed dry air;
s10, vertically sending the blow-dried gas diffusion plate into an oven for baking, and taking out the gas diffusion plate after baking;
in the step S3 and the step S6, a sand blasting machine is adopted to perform sand blasting treatment on two surfaces of the gas diffusion plate respectively, wherein the air pressure of the sand blasting treatment in the step S3 is 0.5Mpa, the sand material adopts 80# alumina sand, the moving speed of a spray gun is 35m/min, and the translation distance of the spray gun is 20mm; the air pressure of the sand blasting treatment in the step S6 is 0.4Mpa, the sand material adopts 80# alumina sand, the moving speed of the spray gun is 35m/min, and the translation distance of the spray gun is 20mm;
in the steps S4 and S5, the density of the sodium hydroxide solution is 5-15g/L, wherein the soaking time in the step S4 is 30min, and the soaking time in the step S5 is 10min;
in the step S7, the cleaning solution for chemical cleaning is a sodium hydroxide solution with the density of 60-80g/L and the temperature of 50-60 ℃, and the cleaning time is 30S; the concentration of the nitric acid solution is 10-20%, the temperature is 30-40 ℃, and the soaking time is 5min;
in the step S8, the density of the sulfuric acid solution is 180 to 220g/L, the temperature is 15 to 20 ℃, and the oxidation time is 20min.
2. The method for regenerating a gas diffusion plate for use in the production of a large-generation liquid crystal panel according to claim 1, wherein: in the step S1, the gas diffusion plate is placed on a marble platform, the flatness of the gas diffusion plate is detected by using a laser coordinate system, and the measured flatness value is compared with a standard value, so that whether the gas diffusion plate is qualified or not can be judged.
3. The method for regenerating a gas diffusion plate for use in the production of a large-generation liquid crystal panel according to claim 1, wherein: in the step S2, the unqualified gas diffusion plate is sent into a shaping furnace, the temperature in the shaping furnace is gradually increased from room temperature to 550 ℃ within 12 hours, then the temperature is kept at 550 ℃ for 12 hours, then the gas diffusion plate is gradually cooled to room temperature within 12 hours and then taken out, then the shaped gas diffusion plate is placed on a marble platform, the flatness of the gas diffusion plate is detected by adopting a laser coordinatograph, and the measured flatness value is compared with a standard value to obtain the qualified gas diffusion plate.
4. The method for regenerating a gas diffusion plate for use in the production of a large-generation liquid crystal panel according to claim 1, wherein: in step S3, the presence or absence of foreign matter generated during use in each gas diffusion hole of the gas diffusion plate is checked using a microscope with a magnification of 200.
5. The method for regenerating a gas diffusion plate for use in the production of a large-generation liquid crystal panel according to claim 1, wherein: in the steps S4 and S5, the pressure of the high-pressure cleaning is 50Mpa, and the cleaning time is 1h.
6. The method for regenerating a gas diffusion plate for use in the production of a large-generation liquid crystal panel according to claim 1, wherein: in the step S10, the baking temperature is 150 ℃ and the baking time is 2h.
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